VULNERABILITY INTELLIGENCE

CVE-2018-20421

CVSS score7.5 HIGH
EPSS probability1.46%
CISA KEVNot currently listed
Published2018-12-24
Last modified2026-06-17
CVSS vectorCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

Go Ethereum (aka geth) 1.8.19 allows attackers to cause a denial of service (memory consumption) by rewriting the length of a dynamic array in memory, and then writing data to a single memory location with a large index number, as demonstrated by use of "assembly { mstore }" followed by a "c[0xC800000] = 0xFF" assignment.

Weakness classification

  • CWE-770: Allocation of Resources Without Limits or Throttling

Primary references